<!DOCTYPE HTML>
<html>
<head>
  <title>My WebSocket</title>
</head>

<body>
<input id="text" type="text" />
<button onclick="send()">Send</button>
<button onclick="closeWebSocket()">Close</button>
<div id="message"></div>
</body>

<script type="text/javascript">
  var websocket = null;

  //判断当前浏览器是否支持WebSocket, 主要此处要更换为自己的地址
  if ('WebSocket' in window) {
    websocket = new WebSocket("ws://localhost:8080/test/oneToMany");
  } else {
    alert('Not support websocket')
  }

  //连接发生错误的回调方法
  websocket.onerror = function() {
    setMessageInnerHTML("error");
  };

  //连接成功建立的回调方法
  websocket.onopen = function(event) {
    //setMessageInnerHTML("open");
  }

  //接收到消息的回调方法
  websocket.onmessage = function(event) {
    setMessageInnerHTML(event.data);
  }

  //连接关闭的回调方法
  websocket.onclose = function() {
    setMessageInnerHTML("close");
  }

  //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
  window.onbeforeunload = function() {
    websocket.close();
  }

  //将消息显示在网页上
  function setMessageInnerHTML(innerHTML) {
    document.getElementById('message').innerHTML += innerHTML + '<br/>';
  }

  //关闭连接
  function closeWebSocket() {
    websocket.close();
  }

  //发送消息
  function send() {
    var message = document.getElementById('text').value;
    websocket.send(message);
  }
</script>
</html>